Short answer: the Oriolus Monachaa. It ranks #553 of 1291 in-ear headphones by sound quality, rated 3.8/5, at $2,000; the Unique Melody MEST Jet Black ranks #773, rated 3.6/5, at $1,999. With prices this close, go by the sound-quality ranking rather than the cost.
Why pick the Oriolus Monachaa: An all dynamic IEM with four dynamic drivers per side. Watch for: It is sold mainly through European dealers.
What the Unique Melody MEST Jet Black does well: A flagship in Unique Melody’s MEST family, combining dynamic, balanced armature, electrostatic and bone conduction drivers. The catch: Treble sits about 3.7 dB below target, a dark, relaxed balance.
Buy the Oriolus Monachaa. It is rated higher for sound quality, and saving $1 with the Unique Melody MEST Jet Black does not make up for the sound-quality gap.
Still deciding? The full Headphones rankings cover every ranked option.
An all dynamic IEM with four dynamic drivers per side.
Audio Essence eBay
A flagship in Unique Melody’s MEST family, combining dynamic, balanced armature, electrostatic and bone conduction drivers.
HiFiGo $1,999.00 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Oriolus Monachaa | Unique Melody MEST Jet Black | |
|---|---|---|
| Price | $2,000 | $1,999.00 |
| Ranked | #553 of 1291 in In-Ear Headphones | #773 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Quadbrid |
| Drivers | 4 x dynamic | 1 x dynamic + balanced armatures + 2 x electrostatic + bone conduction |
| Impedance | 24 ohms | 12.6 ohms |
| Sensitivity | 111 dB SPL/mW | 106 dB @ 1kHz |
| Harman Preference Score | 72 (median of 4 squig.link measurements, calibrated to AutoEQ) | 68 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.97 dB standard deviation | 2.41 dB standard deviation |
| Tonal Tilt | -0.54 (negative is warmer, positive brighter) | -0.64 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+3.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the Oriolus Monachaa from dchpgall, hbb, jaytiss and smirk; the Unique Melody MEST Jet Black from atechreviews, silicagel, sl0the and superreview, all via squig.link.
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